import dis
import time


def task1():
    for i in range(3):
        print('A' + str(i))
        ret_mes = yield '发送了A' + str(i)
        print('收到' + ret_mes)


def task2():
    for i in range(3):
        print('B' + str(i))
        ret_mes = yield '发送了B' + str(i)
        print('收到' + ret_mes)

def abc():
    t = (1, [20,30],3)
    t[1] += [40,50]

if __name__ == '__main__':
    abc()

